Modified "Update Fixlet" README to better explain the XML structure

Adding file link

Minor wording change

Added screenshots

Adding another screenshot

Adding link to fixlet.xml

update-fixlet/cURL/README.md

@@ -1,3 +1,60 @@
+Equivalent Action in Console
+===
+Right-click a Fixlet and select "Edit".
+![Getting to the "Edit Fixlet" dialog](../img/edit-fixlet.png)
+
+Explanation of [`fixlet.xml`](fixlet.xml)
+===
+* Title - (Permissible Values: any string) The name of the Fixlet
+* Description - (Permissible Values: any string) A user-defined description of what the Fixlet does; can contain HTML content (if HTML is used, should be contained in a `<![CDATA[ ... ]]>` block.
+
+![Image of fixlet description screen](../img/update-fixlet-description.png)
+This screenshot shows the fixlet's title, description, and lists the descriptions of its actions.
+
+* One or more *Relevance* tags, or a single *GroupRelevance* tag
+  * Relevance - (Permissible Values: any relevance expression that evaluates to true or false) A relevance statement that evaluates to true when executed against computers that this Fixlet should run on. All Relevance tags must evaluate to `true` in order for the Fixlet to run.
+  * GroupRelevance - Same as relevance but for Computer Groups that this Fixlet should run on.
+
+![Image of fixlet relevance screen](../img/update-fixlet-relevance.png)
+This screenshot shows where the contents of the `Relevance` tags go.
+
+* Category - (Optional, defaults to `""`) (Permissible Values: any string) User-defined groupings (for example, "Licensing", "Update", "Computer Support")
+* DownloadSize - (Optional, defaults to `0`) (Permissible Values: any non-negative integer) The size of the download that this Fixlet will run.
+* Source - (Optional, defaults to `""`) (Permissible Values: any string) The organization or company that produced this Fixlet
+* SourceID - (Optional, defaults to `""`) (Permissible Values: any string) The ID of that organization or company
+* SourceReleaseDate - (Optional, defaults to `""`) (Permissible Values: any valid date in the format `yyyy-mm-dd`) The date this Fixlet was released
+* SourceSeverity - (Optional, defaults to `""`) (Permissible Values: any string) How important this Fixlet is (Critical, Moderate, etc.)
+* CVENames - (Optional, defaults to `""`) (Permissible Values: any string) The CVE (Common Vulnerabilities and Exposures) ID that this Fixlet addresses, if any
+* SANSID - (Optional, defaults to `""`) (Permissible Values: any string) The SANS ID that this Fixlet addresses, if any.
+* MimeField  - (Optional)
+  * Name - (Permissible values: any string)
+  * Value - (Permissible values: any string)
+* Domain - (Optional) (Permissible Values: Exactly 4 basic Latin characters)
+* Delay - (Optional) (Permissible Values: strings matching the regular expression `P([0-9]+D)?(T([0-9]+H)?([0-9]+M)?([0-9]+(\.[0-9]{1,6})?S)?)?`)
+
+![Image of fixlet properties screen](../img/update-fixlet-properties.png)
+This screenshot shows other properties that the fixlet can have.
+
+* DefaultAction - (Optional; if omitted then no default action set) The Action to take by default (select the "This action is the default action" checkbox; bolded in the "Take Action" menu)
+  * _Attribute "ID"_ - (Permissible Values: any string) The name of this action. In the console, this is automatically be set to something like `Action1`.
+  * Description - (Optional, defaults to `""`) The text that appears in the Actions box of the Description tab of a Fixlet. Clicking on the link will initiate the "Take Action" dialog box
+    * PreLink - (Permissible Values: any string) The text that comes before the link
+    * Link - (Permissible Values: any string) The text that will be a link
+    * PostLink - (Permissible Values: any string) The text after the link
+  * ActionScript - (Permissible Values: any ActionScript)
+    * _Attribute "MIMEType"_ - (Optional, defaults to BigFix ActionScript)
+* Action - (Optional, Repeatable; if omitted then no default action set) An Action that this Fixlet can take. Any number of these tags can appear; each will create a separate Action.
+  * _Attribute "ID"_ - (Permissible Values: any string) The name of this action. In the console, this is automatically be set to something like `Action1`.
+  * Description - (Optional, defaults to `""`) The text that appears in the Actions box of the Description tab of a Fixlet. Clicking on the link will initiate the "Take Action" dialog box
+    * PreLink - (Permissible Values: any string) The text that comes before the link
+    * Link - (Permissible Values: any string) The text that will be a link
+    * PostLink - (Permissible Values: any string) The text after the link
+  * ActionScript - (Permissible Values: any ActionScript)
+    * _Attribute "MIMEType"_ - (Optional, defaults to BigFix ActionScript)
+
+![Image of fixlet actions screen](../img/update-fixlet-actions.png)
+This screenshot shows the actions in this fixlet (there is only one, in this case). Notice that the `This action is the default action` button is checked; this is because the action was declared in a `DefaultAction` tag, rather than an `Action` tag. The `MIMEType` attribute of the `ActionScript` tag determines the script type.
+
 Usage
 ---